package com.bw.service.impl;

import com.alibaba.dubbo.config.annotation.Reference;
import com.alibaba.dubbo.config.annotation.Service;
import com.bw.pojo.goods.Category;
import com.bw.pojo.goods.Sku;
import com.bw.pojo.order.OrderItem;
import com.bw.service.goods.CategoryService;
import com.bw.service.goods.SkuService;
import com.bw.service.order.CartService;
import com.bw.service.order.PreferentialService;
import com.bw.util.CacheKey;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;

import java.util.*;
import java.util.stream.Collectors;

@Service
public class CartServiceImpl implements CartService {

    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private PreferentialService preferentialService;

    @Reference
    private SkuService skuService;

    @Reference
    private CategoryService categoryService;

    @Override
    public List<Map<String, Object>> findCartList(String username) {

        List<Map<String, Object>> cartList = (List<Map<String, Object>>) redisTemplate.boundHashOps(CacheKey.CART_LIST).get(username);
        if (cartList ==null){
            cartList=new ArrayList<>();
        }
        return cartList;
    }

    @Override
    public void addItem(String username, String skuId, Integer num) {
        //实现思路：遍历购物车，如果购物车中存在该商品则数量累加，如果不存在则添加购物车项
        //获取购物车
        List<Map<String, Object>> cartList = findCartList(username);
        boolean flag = false;//是否在购物车中存在
        for (Map map: cartList) {
            OrderItem orderItem = (OrderItem) map.get("item");
            if (orderItem.getSkuId().equals(skuId)){//购物车存在该商品
                if (orderItem.getNum()<=0){
                    cartList.remove(map);//购物车项删除
                    break;
                }
                int weight = orderItem.getWeight()/orderItem.getNum();//单个商品的重量
                orderItem.setNum(orderItem.getNum()+num);//数量累加
                orderItem.setMoney(orderItem.getNum()*orderItem.getPrice());//金额计算
                orderItem.setWeight(weight*orderItem.getNum());//重量计算
                if (orderItem.getNum()<=0){
                    cartList.remove(map);//购物车项删除
                }
                flag=true;
                break;
            }
        }

        if (flag==false){//购物车不存在该商品
            Sku sku = skuService.findById(skuId);
            if (sku==null){
                throw new RuntimeException("商品不存在");
            }
            if (!"1".equals(sku.getStatus())){
                throw new RuntimeException("商品的状态不合法");
            }
            if(num<=0){//数量不能为0或负数
                throw new RuntimeException("商品的数量不合法");
            }
            OrderItem orderItem = new OrderItem();
            orderItem.setSkuId(skuId);
            orderItem.setNum(num);
            orderItem.setSpuId(sku.getSpuId());
            orderItem.setImage(sku.getImage());
            orderItem.setPrice(sku.getPrice());
            orderItem.setName(sku.getName());
            orderItem.setMoney(orderItem.getPrice()*num);//金额计算
            if (sku.getWeight()==null){
                sku.setWeight(0);
            }
            orderItem.setWeight(sku.getWeight()*num);//重量计算
            //商品分类
            orderItem.setCategoryId3(sku.getCategoryId());
            Category category3 = (Category) redisTemplate.boundHashOps(CacheKey.CATEGORY).get(sku.getCategoryId());
            if (category3==null){
                category3 = categoryService.findById(sku.getCategoryId());//根据3级分类id查2级
                redisTemplate.boundHashOps(CacheKey.CATEGORY).put(sku.getCategoryId(),category3);
            }
            orderItem.setCategoryId2(category3.getParentId());
            Category category2= (Category) redisTemplate.boundHashOps(CacheKey.CATEGORY).get(category3.getParentId());
            if (category2==null){
                category2 = categoryService.findById(category3.getParentId());//根据2级分类id查询1级
                redisTemplate.boundHashOps(CacheKey.CATEGORY).put(category3.getParentId(),category2);
            }
            orderItem.setCategoryId1(category2.getParentId());

            Map map = new HashMap();
            map.put("item",orderItem);
            map.put("checked",true);//默认选中

            cartList.add(map);
        }
        redisTemplate.boundHashOps(CacheKey.CART_LIST).put(username,cartList);

    }

    @Override
    public boolean updateChecked(String username, String skuId, boolean checked) {
        //获取购物车
        List<Map<String,Object>> cartList = findCartList(username);
        //判断缓存中是否含有已加购商品
        boolean isOk = false;
        for (Map map:cartList){
            OrderItem orderItem = (OrderItem) map.get("item");
            if (orderItem.getSkuId().equals(skuId)){
                map.put("checked",checked);
                isOk=true;//执行成功
                break;
            }
        }
        if (isOk){
            redisTemplate.boundHashOps(CacheKey.CART_LIST).put(username,cartList);//存入缓存
        }
        return isOk;
    }

    @Override
    public void deleteCheckedCart(String username) {
        //获取未选中的购物车
        List<Map<String,Object>> cartList = findCartList(username).stream()
                .filter(cart ->(boolean) cart.get("checked")==false).collect(Collectors.toList());
        redisTemplate.boundHashOps(CacheKey.CART_LIST).put(username,cartList);//存入缓存
    }

    @Override
    public int preferential(String username) {
        //获取选中的购物车 List<OrderItem>   List<Map>
        List<OrderItem> orderItemList = findCartList(username).stream().filter(cart -> (boolean) cart.get("checked")==true).map(cart ->(OrderItem)cart.get("item")).collect(Collectors.toList());
        //按分类聚合统计每个分类的金额   group by
        Map<Integer, IntSummaryStatistics> cartMap = orderItemList.stream().collect(Collectors.groupingBy(OrderItem::getCategoryId3,Collectors.summarizingInt(OrderItem::getMoney)));
        //循环结果，统计每个分类的优惠金额，并累加
        int allPreMoney=0;//累计优惠金额
        for (Integer categoryId: cartMap.keySet()){
            //获取品类的消费金额
            int money = (int) cartMap.get(categoryId).getSum();
            int preMoney = preferentialService.findPreMoneyByCategoryId(categoryId,money);//获取优惠金额
            allPreMoney+=preMoney;
        }
        return allPreMoney;
    }

    @Override
    public List<Map<String, Object>> findNewOrderItemList(String username) {
        //获取选中的购物车
        List<Map<String,Object>> cartList = findCartList(username);
        //循环购物车列表，重新读取每个商品的最新价格
        for (Map<String,Object> cart:cartList){
            OrderItem orderItem = (OrderItem) cart.get("item");
            Sku sku = skuService.findById(orderItem.getSkuId());
            orderItem.setPrice(sku.getPrice());//更新价格
            orderItem.setMoney(sku.getPrice()* orderItem.getNum());//更新金额
        }
        redisTemplate.boundHashOps(CacheKey.CART_LIST).put(username,cartList);//存入缓存
        return cartList;
    }
}

